Back portion of a golf club head



FIG. 1 is an enlarged fragmented perspective view from the toe of the back portion of a golf club head of the present invention;

FIG. 2 is a perspective view from the toe end;

FIG. 3 is an elevational view of FIG. 2;

FIG. 4 is a right side view of FIG. 2; and,

FIG. 5 is a bottom view of FIG. 2.

The broken lines showing at least a portion of an oval in FIGS. 1, 2 and 3 show a potential area for adaptation of a logo and form no part of the claimed design. The broken lines showing portions of a golf club head in FIGS. 1-5 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a back portion of a golf club head, as shown and described. 